The conjunction يۇ may be attached directly to the end of the first phrase in a two-phrase sentence, and is used to express the speaker's disbelief about the subject's ability to complete an action. It may be seen as being analogous to the English "if even... can't..., then how can...?"

If even I don't know this, how would you know?

بۇئىشنىمەنبىلمەيمەنيۇ،سىزقانداقبىلىسىز؟

If I - as young as I am - can't make it out, then how would you, old as you are, be able to?